Defines the area with which the action operates.
This value gives the rank by percentage. For each pixel in the input image, the rank action sorts all pixels within a radius by pixel value, and copies the rank'th value to the output image. To give a better understanding, these are example values:
- 0% delivers the same result as the Minimum action
- 50% delivers the same result as the Median action
- 100% delivers the same result as the Maximum action